Adjustable drawing-board



W. BOON.

ADJUSTABLE DRAWING BOARD. APPLICATION man luLY 26,1920. 1,401,458, Patented D90. 27, 1921.

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w. L. ooN. ADJUSTABLE DRAWING BOARD.

APPLICATION FILED JULY 25| |920.

1,401,458. f Patented Dec. 27, 1921.

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| 2 J//g I Ehi/4 0 awuwwoc "boar and the frame on line 6--6 of Fig. 5,

boar

PATENT OFFICE.

WILFRED L. BOON, OF NORTH ATTLEBORG, MASSACHUSETTS.

ADJUSTABLE DRAWING-BOARD.

To all whom t may concern:

Be it known that I, WILFRED L. Boon, a subject of the Kin of Great Britain, residing `at North Att eboro, in the county oi: Brlstol and State of Massachusetts, have invented certain new and useful Improvements in Adjustable DrawingBoards, ot which the followin is a specification.

This invention re ates to an improvement in adjustable drawing boards, and has for its object to provide simple and effective means whereby a drawin board may receive universal adjustment an be readily locked in an y adjusted position to facilitate work in t ereon. he nature and advantages of the invention will be better understood when the following detail description is taken in connection with the accompanying drawings, the invention residing inthe comblnation and arran ement of parts as claimed.

In t e drawings forming part of this specication, like numerals of reference indicate similar parts in the several views and where- Fi re 1 is a perspective view illustrating the rawing board as mounted on my improved adjustablesupport.

Fi 2 is a front view of the drawingsupport. 0

Fig. Y31s adetail showlnga front view of the means for `enga ingthe suspending arm by which the boar may be adjusted vertically on its supportin rame. j

Fig. 4 is a sectiona side elevation of the `frame illustratingi the spring pin for engaging the different oles in the board-supporting arm, whereby the board may be adjusted vertically onits frame.`

Fig. 5 is a rear view showing a portlon of the board and frame and the supporting arm on the board also the spring clamp by which the board is locked to the frame to hold it in adusted position thereon. j j

i `i 6 is a vsectional "edge view of the showing the sprin clamp by which the board is locked to t e frame.

Fig. 7 is a detail showing one of the guide strips which is adapted to be. fixed to the sup orting table or base on which the frame is s idably mounted.

Fig. 8 is a detail in section illustrating the locking means for securing the frame 1n adjustable position on the guide strips. With reference to the drawings, 10 desig- Specication of Letters Patent. Patented Dec. 27 1921. Application sled July'ee,

1920. Serial No. 398,919.

On these guide strips are mounted two slide members or strips 15, each of which is provided with a number of guide clips 16 adapted to engage and slide in longitudinally-disposed grooves 17 in the side edges of the guide strips 11.

The front edge o i: each slide strip 15 1s provided with a spring clip 18 which has a protuberance 19 adapted to engage a corresponding hole 20 in the face of its guide -strip whereby the slide strips are locked in adjusted position along the length of the guide strips.

Near the front end of each slide strip .l havehinged at 21 the board-supporting member 22. To the rear side of this boardsupporting member I have hinged a pair of supporting arms 23 the free end of each of which is provided with a linger 24 which fits into any of the corresponding slots 25 along the face of its slide bar, whereby this board-supporting member may be set at any desired inclination and supported in such position by the said arms 23.

The' middle of this board-supporting :traine 22 is cut away as at 26 to receive' the clamping arm presently described. The frame at the upper edge of this cut away portion is recessed to receive a plate 27 the middle of which is offset inwardly as at 28 providing a groove for the board-suspending arm 29. A guide bar 30 is formed above this groove for guiding the arm therein.

Extending into this groove from the back of this frame is a spring pin `31 pressed forward by means of the bow spring 32 held in the housing 33 at the back of the frame.

The drawing `board is preferably of the usual rectangular shape and of any desired size, and lto the back of this board I have secured a metal disk 35 which is centrally threaded at 36 to receive the thumb screw 37 on which the board is pivotally mounted.

On this disk I have mounted a resilient clamping arm 38 through which this thumb screw 87 passes. To one side of this clamping arm 38 I have hinged at 39 the boardsuspending arm 29, which arm is provided with a plurality of spaced-apart holes l0 adapted to be engaged by the spring pin 31 to support the board in any adjusted position vertically on the member 22, and when the board has been so adjusted it is only necessary to move the same laterally slightly which causes the clamping arm 88 to ride over the edge 4l of the board supporting member and so bind and secure the boardin adjusted position thereto.

By mounting the board on the thumb screw 37 it will be seen that in addition to its vertical adjustment, when the binding arm 38 is disengaged from the member Q2 that the board is then free t0 be rotated on this pin in the plane of its tace and when so rotated to the desired position, by moving the same to one side the clamping arm 38 is caused to engage the edge of the opening 26 in the member 22 and so bind and hold the board in such position without further Fastening. Therefore it will be seen that by the use of this single binding or clamping arm, the board may be held both against rotation and vertical movement. To obtain vertical adjustment it is only necessary to withdraw the clamp from engagement with the edge of the opening 26 in the member 22, then by swinging the board forward the suspending arm 29 is withdrawn from engagement withthe pin 3l leaving `the board Jfree to be moved either up or down and when so vertically adjusted it is only necessary to swing it back against the member 22 and by a slight vertical movement the spring pin will enter one of the holes 4() and so suspend the board in such position after which it is locked by a lateral movement as before.

My improved drawing-board support is practical in construction and effective in its operation and' by its use the board may be readily adjusted either vertically or in a circle and readily locked in any adjusted position by a single slight lateral movement.

It will also be observed that by mounting the board on the sliding ways the same may be movedback and Wholly out of the way so that the table may be used for other purposes when desired. v When it is desired to use a board of larger dimensions the extension arms 42 and 43 may be swung out both from the top and bottom edges of the frame to support this larger board.

The foregoingl description is directed solely Ytoward the construction illustrated, but I desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being delined and limited only by the terms oit the appended claims.

I claim:

l. In an adjustable drawing beard, o. frame including a board supporting member, said member being adjustable to an inclined position on the frame, a board pivotally supported on said member to be iotated in the plane of its working surface in all positions ol' said member and also being shiiitable on said frame, a means rendered ei'lective and ineffective i'orloelring thehoard in any position to said member when said board, is shifted.

2. In an adjustable drawing board, a frame including a board supporting member adjustable to an inclined position on the frame, a board suspended on said meniber, means whereby the suspending meins may be moved to adjust said board vertically on said member, said board also having` :i rotatable movement relative to said member in the plane o'll its working sur'ace and 'lurther having a lateral shitting movement` a means rendered effective and ineffective l'or locking the board to said member in adjusted positions when laterally shi'ilmt 3. In an adjustable drawing board, :i frame including a hoard supporting member adjustable to an inclined position on the trame, a drawing board, an arm (i1-:tending substantially parallel to said board and connected thereto, said arm being adjustably connected to said member for suspending said board thereon, said board being also pivotally connected to said arm to be rotated in a plane parallel with its working surface.

4;. In an adjustable drawing board, a frame, means for suspending said board on said frame, means whereby said suspeinlingr means may be shifted to adjust said board vertically on said frame, and a spring clamping arm on said board for gripping said frame to secure the board thereto. Y

5. A drawing board support comprising :i trame, board supporting member and a base, said member having a longitudinal. adjustment relative to its supporting base, a dra wing board, means for supporting said member and board on an incline, a suspending pin on said member, an adjustable suspending arm on said board having longitudinally spaced apart holes adapted to be engaged by said pin providing a step by step vertical adjustment for said. board, and means lor locking said board to said trame inadjusted position.

6. In an adjustable drawing board,` a frame including a board supporting member adjustable to an inclined position on the frame, a drawing board, an arm extending substantially parallel to said board and conl movement, whereb nected thereto, said arm being adjustably connected to said member for suspending said board thereon, said board being also pivotally connected to said arm to be rotated in a plane parallel with its working surface, means for releasably securing said board to said frame against both rotary and linear movement.

7. In an adjustable drawing board, a frame, a drawing board, a substantially rigid arm extending substantially parallel to said drawing board and pivotally connected thereto, means whereby said arm is vertically adjustably suspended from said frame, whereby the board may be adjusted vertically on the frame and rotated relative thereto, a means for maintaining the board against any movement in all adjusted positions.

8. In an adjustable drawing board, a frame including a board supporting member having a slot therein, a drawing board, an arm pivotally connected to said drawin board, means for adjustably suspendin sai arm from said frame whereby the board may be vertically adjusted, said means admitting of a slight lateral shifting of the board relative to said supporting member, and a resilient clamping member adapted to be moved into and out of engagement with the edge of said slot by said lateral shifting the board may be secured in any of adjusted ositions.

9. In an adjustable rawingr board, a frame including a board su porting member having a slot therein, a rawing board, a

suspending pin on said member and arranged above said slot, an adjustable suspending arm having one end pivotally con nected to said drawing board and having a longitudinal series of spaced openings in its other end adapted to be engaged by said pin, whereby the board ma be adjusted vertically on said member an the arm pivoted on said pin, and a resilient spring arm connected to said drawing board adapted to engage and disengage an edge of said slot, whereby the board may be held against movement in all of the adjusted positions.

l0. In an adjustable drawing board support, a frame comprising a base and a board supporting member, said. base including a pair of spaced guide strips having an adjustable extension, the extremities of said strips and said extension being provided with laterally extending lips to grip the opposite edges of a table or the like, a slide on each of said guide strips, means for adjustably maintaining said slides in various positions along the length of said guides, said board supporting member extending between said slides and having one end hingedly connected to each of said slides, whereby said member may be adjusted to inclined positions on the base, and supporting legs pivotally connected to said member and adapted to engage in notches along the length of said slides, whereby the board may be adjustably supported in inclined positions.

In testimony whereof I aiiix my signature.

WILFRED L. BOON. 

